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    <script>
        var age = 21;//整数型
        var Age = 21.3473;//小数

        console.log(Number.MAX_VALUE * 2);
        console.log(-Number.MAX_VALUE * 2);
        console.log('字符串' - 100);

        // isNaN()方法的使用
        console.log(isNaN(12));
        console.log(isNaN('字符串'));
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